4. Two bars are placed as shown. First, indicate if the bars are "in parallel" or "in series" and explain why, Calculate the total deflection at point A. Ignore the effect of stress concentration. 10,000 lb Area = 4 in2 %3D E = 30,000,000 psi 10 in Area = 10 in2 E = 20,000,000 psi 10 in

determine the deflection at point D of the beam shown using virtual work method. 150kn E=70 GPa I=1000(10^2) mm^2

The 25-lb rectangular plate has a natural period of vibration t = 0.4 s, as it oscillates around the axis of rod AB. Neglect the mass of the rod. Suppose that a = 2 ft. b = 4 ft. (Figure 1) Figure Part A Determine the torsional stiffness of the rod, measured in lb-ft/rad. Express your answer in pound-feet per radian to three significant figures. ΕΠΙΑΣΦvec k= ^ A ? lb-ft/rad

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B P A y W Find the Vertical Position of the Centroid marked as y on the Diagram using the transform section method, transforming all your material to Material A. Your Answer should be in mm to 1 decimal place. J-22.0 mm, P=76.8 mm, W-187.2mm, Young's Modulus of Material A = 64.5 GPa, Yield Stress of Material A = 145.9 MPa, Young's Modulus of Material B = 94.4 GPa, Yield Stress of Material B = 272.9 MPa.